• 한국생산제조학회지
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• 제23권6호
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• pp.636-641
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• 2014

This paper discusses the fabrication process for a Nipkow disk using micro-lens and pinhole disks. The confocal measuring system that uses the Nipkow disk has the advantage in measuring speed, because the Nipkow disk can simultaneously provide confocal images of all pixels in a CCD camera without requiring a lateral scanning unit. A micro-lens configuration, which focuses illumination on a pinhole, overcomes the low optical efficiency of the Nipkow disk system and allows its use in practical applications. This paper describes how to design the Nipkow disk in terms of numerical aperture, particularly for measuring the height of solder bumps in packaging application and for hybrid processes combining mechanical and semiconductor processes.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 춘계학술대회 논문집
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• pp.173-180
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• 2008

The major objective of this study is to proposal of measuring method and design for the testing curved railway in which the tilting train runs. In order to the speed-up of conventional lines that have many curve lines, there needs a improvement construction of substructure such as the straight or double track work and so on. But in this case, it needs to have a plenty of the cost and the period. Therefore, the tilting train which provides the high-speed service effectively in curve tracks was developed. Besides, the efficiency prediction and the linear synthesis of the existing conventional line for a tiling train service were examined on the preceding studies. So, in this paper we propose the measuring plan and the design of the improvement sections in the testing curved track which was decided as a results of material analysis and field research concerning the extension possibility of transition curves and the bearing of track due to the new developed train traveling. And we look forward to playing a decisive role as reference data on the improvement construction project for the commercial service of the tilting train.

• 한국컴퓨터정보학회논문지
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• 제6권4호
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• pp.104-109
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• 2001

본 논문에서는 정현파 줄무의 패턴을 이용하여 고속이면서도 정밀하게 측정체 표면의 3차원 형상을 측정하는 시스템을 구성하였다. 또한 획득영상의 위상정보 부족 영역에대하여 효율적인 위상복원 방법을 사용하여 측정효율을 높이는 방법을 제안하였고 이를 실험적으로 확인하였다. 카메라의 측정각도와 측정체의 형상에 따라 카메라에 획득되는 영상에는 필연적으로 위상 정보가 부족한 영역이 존재하며 본 논문에서는 이 영역을 추출하고 가변 크기의 위상복원 창과 가변 비율을 갖는 정규화 방법을 사용하여 위상을 효과적으로 복원함으로써 시스템의 측정 효율을 높였다.

• Current Optics and Photonics
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• 제2권6호
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• pp.568-575
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• 2018

Various techniques to measure the three-dimensional (3D) surface profile of a 3D micro- or nanostructure have been proposed. However, it is difficult to apply such techniques directly to industrial uses because most of them are relatively slow, unreliable, and expensive. The HiLo optical imaging technique, which was recently introduced in the field of fluorescence imaging, is a promising wide-field imaging technique capable of high-speed imaging with a simple optical configuration. It has not been used in measuring a 3D surface profile although confocal microscopy originally developed for fluorescence imaging has been adapted to the field of 3D optical measurement for a long time. In this paper, to the best of our knowledge, the HiLo optical imaging technique for measuring a 3D surface profile is proposed for the first time. Its optical configuration and algorithm for a precisely detecting surface position are designed, optimized, and implemented. Optical performance for several 3D microscale structures is evaluated, and it is confirmed that the capability of measuring a 3D surface profile with HiLo optical imaging technique is comparable to that with confocal microscopy.

• 한국산학기술학회논문지
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• 제17권4호
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• pp.92-99
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• 2016

풍력터빈은 정격풍속미만에서 최대출력을 내기위한 제어를 한다. 최대출력을 얻기 위한 방법 중에는 최적 TSR(Tip Speed Ratio)제어와 P&O(Perturbation and Observation) 제어가 대표적이라 할 수 있다. P&O 제어는 출력과 회전속도만을 이용하여 간단한 알고리즘으로 제어되지만 반응속도가 느린 것이 단점이라 할 수 있다. 최적 TSR 제어는 반응속도가 빠르지만 정확한 풍속을 알아야만 된다. 정확한 풍속을 구하기 위하여 측정을 하거나 예측하는 방법을 사용한다. 풍속을 측정하기 위하여 풍속계를 풍력터빈에 가까이 설치하게 되는 데, 이 때 블레이드의 간섭으로 정확한 풍속 측정이 쉽지 않다. 그래서 풍속을 예측하는 방법들이 사용하게 되었다. 풍속을 예측하기 위하여 신경망을 비롯한 다양한 수치해석 방법들이 사용되고 있으나 풍속예측 문제는 역문제와 관련이 있어 그리 간단치가 않다. 본 논문에서는 기존의 방법들과 다르게 역문제로 풀지 않고 바람의 출력그래프에서 터빈의 출력과 회전속도만을 이용하여 풍속을 예측할 수 있는 새로운 방법을 제안하였다. Matlab/Simulink을 사용하여 제안된 방법으로 풍속이 제대로 예측되며 최대 출력제어가 되는 것을 확인하였다.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2001년도 춘계학술대회 논문집(한국공작기계학회)
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• pp.346-351
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• 2001

The technique of high speed machining is widely studied in machining field. Because the high efficiency and accuracy in machining can be obtained in high speed machining. Unfortunately the development of tool for high speed machining is not close behind that of machining tool. So in this study, we made 4 types flat end mill for obtaining data according to tool shape. Especially, we concentrated in helix angle and number of cutting edge. First we confirmed cutting condition by several experiments and measuring cutting force, tool life, tool wear and chip shape according to cutting length. In results, we acquired the fact that 45 degree helix angle and six cutting edge tool is suitable for high speed machining.

• 한국생산제조학회지
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• 제9권3호
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• pp.96-102
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• 2000

High speed machining aims to raise the productivity and efficiency by making more precise and higher value-added products than any other machining method by means of the high speediness of spindle and feed drive system. The purpose of this study is to investigate the effects of the run-out of endmill on the dimension precision of workpiece and to obtain the fundamental data on high speed machining which is available by machining the side of Al-alloy with solid carbide endmills in high speed machining center and by measuring dimensions and surface roughness. From the results of experimentation following are obtained ; if spindle speed is ultra high in conditions that radial depth of cut and feed per tooth are very small highly precise and accurate products are to be made efficiently with high feed rate. and so we can raise productivity.

• 천문학논총
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• 제8권1호
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• pp.33-45
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• 1993

The variation of instrumental profile for the different scan speed of PDS is estimated as FWHM of the assumed Gaussian Profile. The effects of scan speed and scan aperture of PDS on the objective prism spectrum analysis are investigated for 8 combinations of scan speed and scan aperture. Amomg them. D1 apture with 15 csu is found to be the most optimum choice for measuring KISO objective prism film. We suggest the preliminary test study of the scan speed and aperture for the optimum use of PDS for any massive scan of spectra. The optimum scan speed and aperture depends on the dispersion of spectrum as well as the type of phtographic emulsion.

• 한국기계가공학회지
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• 제3권3호
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• pp.32-38
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• 2004

Recently, the system of high speed milling(HSM) is widely used for reducing the operation time and maximizing efficiency of work. The most research of high speed milling system is still leaves much to be desired. Specially the research of mass pocket high speed processing with high precision is the first and probably the last. So this paper showed mass pocket processing of high precision with a duralumin and then confirmed a cause of inferior goods through the CAD/CAM pattern simulation and experimentation. And this paper showed high speed processing system reduce the rate of inferior from this optimal pattern.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2004년도 추계학술대회 논문집
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• pp.381-386
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• 2004

In order to develop a high speed train, various conditions have been considered. Internal noise level of cabins is an important one. In this study, The specification of the interior noise level for KHST(Korean High Speed Train) has been adopted the same level of KTX-spec. In this paper, the interior noise levels of KHST are measured and analysed through the speed and other conditions. According to the speed, the level of internal noise(driver's room(PC2), motorized trailer(TM1) and trailer car(TT2)) is compared. The results of measuring data show that the interior noise levels of KHST are good. And noise levels of this paper are useful in the decision of noise specification.